The Hammers are understood to have now bid in the region of £4million for the Swedish international - just 24 hours after manager Sam Allardyce said they were unlikely to raise their bid from an initial £2m.

Olsson would be interested in a move to the Premier League, although sources close to the player insist he won't force a switch, bur Rovers remain keen to hold on to him.

West Ham are waiting for a final answer but the Lancashire Telegraph understand owners Venky's have again been advised to reject it.